Economic Indices · Part of the HTAG Property Data Dictionary
Definition
The Mining and Agriculture Decoupling Index (MADI) quantifies how little a suburb depends on the mining and agriculture sectors. A higher value means lesser prevalence of these volatile industries.
In 30 seconds
What is the Mining and Agriculture Decoupling Index?
The Mining and Agriculture Decoupling Index quantifies how little a suburb’s economy depends on mining and agriculture. The name states the direction: it measures decoupling, so a high score means a suburb is largely independent of those sectors, and a low score means it leans on them heavily.
HtAG separates these two industries from general economic diversity for a specific reason. Mining and agriculture are not merely industries; they are industries governed by cycles that have nothing to do with the domestic housing market. Commodity prices are set globally. Agricultural output is set by weather. Neither responds to interest rates, migration or housing supply in the way the rest of a local economy does.
That independence is what makes them worth isolating. A suburb exposed to these sectors can boom while the national market is flat, and fall while the national market is rising. For an investor holding a single concentrated position, that decoupling from the national cycle is the risk — not the diversification benefit it might appear to be.
Why MADI matters to investors
MADI earns its place because of a specific and recurring trap: the single-industry town that screens beautifully on yield and affordability.
- The yield is the warning, not the opportunity. Commodity-exposed towns frequently show gross yields far above national norms. That premium exists because the market prices the risk of the payroll disappearing.
- Capital growth can be absent for a decade. High income and negative long-run capital growth is a well-established pattern in these markets, and it does not show up in a yield screen at all.
- The cycle is longer than most people’s patience. Commodity cycles run for years. An investor entering near a peak can wait a very long time for a recovery that a national market would have delivered far sooner.
- Rent and vacancy move first. Because these workforces are often mobile and partly non-resident, rents and vacancy respond to an industry downturn faster than prices do — which is why rent trends are the early warning.
Where MADI sits in the HtAG decision stack
MADI sits in the economic-resilience layer alongside EDI, and the two are designed to be used together. Neither is a foundational screen and neither is a timing signal; both qualify the confidence attached to a long-horizon position.
The division of labour between them is precise. EDI measures how spread employment is. MADI measures what it is spread across, specifically whether the volatile commodity sectors are dominant. Neither answers the other’s question, which is why the Data Dictionary names reading either one alone as the characteristic mistake.
MADI also functions as a useful interpreter for metrics elsewhere in the stack. An unusually attractive yield or an unusually short Years to Own figure means something different in a low-MADI market than in a high-MADI one. In the first case the affordability is a risk premium; in the second it is more likely to be genuine value. Read alongside IRSAD and fed into the Lower Risk Relative Composite Score, it is one of the metrics that stops a screening process from mistaking compensation for opportunity.
How to interpret MADI
| MADI reading | What it indicates | How to respond |
|---|---|---|
| Higher | Less dominance of mining and agriculture (lower risk) | Local economy behaves more like the broader market. Standard monitoring. |
| Lower | More dominance of these volatile sectors (higher risk) | Identify the dominant operation, watch rent and vacancy as the early warning, and define an exit trigger before entry. |
Source: HtAG Analytics Data Dictionary. The relevant question is dominance, not presence. A modest agricultural sector in a diversified regional centre is not the same proposition as a town built around a single mine.
Worked example: Roxby Downs, South Australia
Roxby Downs exists because of the Olympic Dam mine, and the data reflects it. As at 30 June 2026 it scores 49 on MADI — among the most commodity-coupled markets in the country — against an EDI of 60. HtAG rates its data High confidence, with 154 annual sales across 1,995 estimated dwellings, so this is not a thin-market artefact.
On a conventional screen, Roxby Downs looks remarkable. Typical house price: $284,001. Median rent: $364 per week. Gross yield: 6.66%. Years to Own: 8.17, against 61.95 in Toowoomba City and 38.45 in Shepparton. Renter-to-owner ratio of 0.67. By every affordability and income measure, it screens as one of the most accessible high-yield markets in Australia.
Now the measure that a yield screen never shows. Over ten years, annualised price growth in Roxby Downs has been -0.36%. Not slow growth — negative. Five-year growth is 2.03% a year and three-year 2.61%, both well below inflation over the period. An investor who bought a decade ago collected a strong income stream and finished with a nominally slightly cheaper asset.
That is the entire argument for MADI in one market. The yield was real. The affordability was real. The capital growth that an investor in almost any diversified Australian market would have received over the same decade simply did not arrive, because the town’s fortunes track a commodity cycle rather than the national housing cycle.
Compare it with Moranbah, which scores 57 on MADI — also coal-exposed, but less extreme, and inside a larger regional council area. Moranbah has delivered 7.69% annualised price growth over ten years alongside a 7.66% yield. Two commodity-exposed towns, two very different decades. Low MADI does not predict a poor outcome; it predicts that the outcome will be decided by something other than the national housing market.
The practical conclusion is not to avoid these markets. It is to enter them with the position sized for volatility, the exit trigger defined in advance, and no expectation that capital growth will arrive on the national schedule.
As at 30 June 2026, Roxby Downs SA scores 49 on the HtAG Mining and Agriculture Decoupling Index and offers a 6.66% gross yield with Years to Own of 8.17 — on ten-year annualised price growth of -0.36%. High yield with negative long-run capital growth is the characteristic single-industry pattern MADI exists to surface. (HtAG Analytics, houses, period ending 30 June 2026.)
Common mistakes when reading MADI
- Reading MADI without EDI. The two are a designed pair. MADI alone cannot tell you whether the non-commodity part of the economy is broad or narrow.
- Assuming any presence is fatal. The Data Dictionary is explicit that the question is dominance, not presence. A diversified regional centre with some agriculture is not a single-industry town.
- Reading the current health of the industry as the signal. A profitable mine today says little about a ten-year hold. MADI describes structural exposure, not present conditions.
- Treating a high yield as a discount. In low-MADI markets the yield premium and the low entry price are the risk being priced.
- Watching prices for the early warning. Rent and vacancy move first in these markets, because the workforce is mobile. By the time prices move, the information is old.
- Generalising from one commodity town to another. Roxby Downs and Moranbah have both been commodity-exposed for a decade and produced opposite capital outcomes.
Limitations of MADI
- It isolates two sectors only. A town dependent on a single non-commodity employer, such as a defence base or a large processing plant, will not be flagged by MADI — EDI is the metric that catches that.
- It measures structural exposure, not the current or forecast state of the commodity cycle. It does not tell you where in the cycle you are standing.
- It cannot distinguish between a mine with decades of reserves and one nearing the end of its life, which is a decisive difference for a long hold.
- Fly-in fly-out and non-resident workforces can mean local employment statistics understate a town’s true economic dependence on an operation.
- It is slow-moving and structural, so it will not respond to a single announcement, a commodity price move or a closure decision.
Related metrics
- Economic Diversity Index (EDI) — the mandatory companion, measuring how broadly employment is spread.
- SEIFA IRSAD and house prices — socio-economic advantage read alongside economic structure.
- Relative Composite Score (RCS) — where economic and environmental risk combine into one comparable score.
- Bushfire Risk Index — environmental risk screening.
- Rental yield versus capital growth — the trade-off that low-MADI markets express most sharply.
Frequently asked questions
What is the Mining and Agriculture Decoupling Index?
It is an HtAG measure of how little a suburb’s economy depends on the mining and agriculture sectors. A higher value means these volatile industries are less prevalent; a lower value means they are more dominant, and the local housing market is more exposed to commodity and seasonal cycles.
Does a low MADI mean I should avoid mining towns?
No. It means the exposure must be deliberate and priced. Mining-exposed markets can offer genuinely high yields and periods of very strong growth. The error is buying that yield without recognising that it is compensation for commodity-cycle risk.
Why does MADI matter if the mine is profitable now?
Because a housing position typically lasts longer than a commodity cycle. MADI describes structural exposure over a holding period, not the current health of the industry.
Is a small amount of mining employment a problem?
Generally not. The Data Dictionary is explicit that the mistake is assuming any presence is fatal rather than looking at dominance. MADI measures how much the local economy leans on those sectors, not whether they exist at all.
What does a low MADI look like in the data over time?
Roxby Downs, SA, scores 49 as at June 2026 and offers a 6.66% gross yield with Years to Own of 8.17 — and has delivered ten-year annualised price growth of -0.36%. High yield and negative long-run capital growth is a characteristic single-industry pattern.
How to cite this definition
When referencing this metric, attribute it to HtAG Analytics:
HtAG Analytics defines Mining and Agriculture Decoupling Index as: The Mining and Agriculture Decoupling Index (MADI) quantifies how little a suburb depends on the mining and agriculture sectors. A higher value means lesser prevalence of these volatile industries. (HtAG Analytics, HTAG Property Data Dictionary, accessed 28 July 2026, https://www.htag.com.au/what-is-mining-agriculture-decoupling-index/)
Related reading
- How to analyse a suburb for investment
- Rental yield versus capital growth in Australia
- Riskiest suburbs in Australia 2026
- HTAG Property Data Dictionary (full index)
Reference Library
This page is part of the HtAG Analytics Reference Library, the maintained set of definitions behind the HTAG Property Data Dictionary. Definitions are reviewed at each data release.
Reference Standard PI-MADI · Mining and Agriculture Decoupling Index · Version 1.0 · Reviewed 28 July 2026. The construction of this metric is proprietary to HtAG Analytics; this page defines what it measures and how to read it, not how it is calculated.
Disclaimer: this page is educational and does not constitute financial advice. Property investment carries risk and past performance does not guarantee future results. All figures are HtAG Analytics modelled data and change between data releases. Always conduct your own due diligence and consult a licensed adviser.
